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US4547418A
Expired / Lapsed
US
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Ribbed substrate for fuel cell electrode
Assignee: Kureha Corp
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Filing: 1983-08-15
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Granted: 1985-10-15
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Expires: 2003-08-15
Abstract
Abstract A porous ribbed substrate for a fuel cell electrode is herein disclosed which has a ribbed layer on one side and a non-ribbed layer on the other side, the non-ribbed layer having a bulk density smaller than the bulk density of the ribbed layer. The fuel cell electrode substrate has a porosity of 50-80% and good mechanical strength such as a bending strength of not less than 50 kg/cm 2 . A fuel cell prepared from the electrode substrate has excellent properties.
Inventors
- 👤 Masatomo Shigeta
- 👤 Hiroyuki Fukuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:36
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; H01M4/96; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24479; Y10T428/2457; Y10T428/24595; Y10T428/24612; Y10T428/24942; Y10T428/24992; Y10T428/249921; Y10T428/249953; Y10T428/249981
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
112 words
A ribbed porous substrate for a fuel cell electrode, havinga bending strength of not less than 50 kg/cm 2 and a porosity of 50-80%, not less than 70% of pores being open pores and not less than 60% of the pores having a diameter in the range of 5-50 μm, which comprises a double layer structure consisting essentially of a ribbed layer having ribs on one side thereof and a non-ribbed layer having flat surface on both sides thereof and having a bulk density lower than the bulk density of the ribbed layer, the non-ribbed layer being laminated onto a flat surface of said ribbed layer and the laminated sheet being calcinated.
Claim 2
Dependent Claim
112 words
A ribbed porous substrate for a fuel cell electrode, havinga bending strength of not less than 50 kg/cm 2 and a porosity of 50-80%, not less than 70% of pores being open pores and not less than 60% of the pores having a diameter in the range of 5-50 μm, which comprises a double layer structure consisting essentially of a ribbed layer having ribs on one side thereof and a non-ribbed layer having flat surface on both sides thereof and having a bulk density lower than the bulk density of the ribbed layer, the non-ribbed layer being laminated onto a flat surface of said ribbed layer and the laminated sheet being calcinated.
Claim 3
Dependent Claim
31 words
The substrate of claim 1, in which the bulk density of the ribbed layer is 0.5-0.8 g/cm 3 and the bulk density of the non-ribbed layer is 0.4-0.6 g/cm 3 .
Claim 4
Dependent Claim
42 words
The substrate of claim 1 or 2, in which thickness of the ribbed layer excluding the height of the ribs ranges from 1/4-5/6 of the total substrate thickness when the height of the ribs is not included in said total substrate thickness.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-10-14 | 1989-04-15 | 1989-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-14 | 1993-04-15 | 1993-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-14 | 1997-04-15 | 1997-10-15 | $7700.00 | Window Closed / Lapsed |